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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8ead784ab61ef406b5414298b4795ec3e4d6efbb70ea7d3892f3b1c9a951bf' 
  AND token = 'p2QgLXEdq61vdK357D0+dEcGINTO/CVGcu/ddyjNON4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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