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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ba229aebb51d95ec544f9db3f147c51cfabdc6cf878402535b1bcf6b066b36' 
  AND token = '5WLswkoq54XUlbouq8xrFP8Cs5wjhGPOqX4ZXNTgnQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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