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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cbdddf2a9515aca6f5b021c0c7053fe78a0a15ddb8fb1e69f5a48732f3cc87e' 
  AND token = 'YLP5YGZ9sOiLE78b7yres+4DUbhft+HACrRCGRPl9UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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