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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a65efbc63ed2df961db87d4870de19546c1781cec89bb2649ae9368a193776' 
  AND token = 'QHdAjO6hTss/eXPand52rA9fvBeH8GlHy8V5PMVU1OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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