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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d93c6a38a8b774ac93881b86d71c3d1837bb99a63f23a4e31fe88af56e0b8e0' 
  AND token = 'mbkYaHCbUn8W8v3o+ONQy18nWbesnn0kREnWvJddnhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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