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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103b089c94da028511f145ae464c19fd31fc63c0ec3b72db6a292e9582714adf' 
  AND token = 'iWy0i5kpxh5Ico3C6XhfpVrjdsXvBbS4vJ9Wgh1Bf0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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