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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abc6cd2d4347f8b4c27319fe21ff2976589439306ae7ec2b7e71a1b92f1a09c' 
  AND token = 'kgldlG+ZkdC5r9+Zroc630B2hr+TTudYkSXQljMyU5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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