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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984d793d4f87fb3c9abb411a7d99fbaeb67550663a605856f63143bfcb55c1e1' 
  AND token = 'Ol6OdYA30zUoORvqALYpF7OiykOoPDC3At/EwMNG+qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}