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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562d1e41c21a163f63430ad7244471d0029efd72c615857772ef32215e87fc64' 
  AND token = '3WyPFgSbKiIGAUfyAX4uP1Dm3cKAoIbWE0DOWnZNg6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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