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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffae0804e2dbb6ff7b64a3811eea3a4a0980d50992483119fe97b3ee7eb3093e' 
  AND token = 'bkuxLwAhCJCMWU/mcgQ6jfjzc7m3QRw3JQeQq6zX1xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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