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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9841044238904f8724cde944314c842c9c00f033f036e0f9a8de9821cc7cad4a' 
  AND token = '32sMFKbWKuLouI7X1MMARNBPncPfa0qK99+dtB9JZgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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