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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dcf551025d8f9af07c89a313803b056cfc8614b075efd1aa054c22b8497897b' 
  AND token = 'tyNHv12jSd0UnLYuNy5fkwaczJyneMHizof+9EyqsbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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