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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f948cc06e8464962b71115d7a2e771d7d09ea858ec4eb7b50544af92ac39aca0' 
  AND token = 'uLd7e4Sg4EaOGNnpvUEn2kELFT9yWSZ3js0sNET8YUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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