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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18bfd6bf0c7412f6055c20d87bd9527ba2cea30e6f82db5c31f171cb3930f71' 
  AND token = '2AuLUMWaFR4mL6r6NeyAUyTpVi1evxRZL8fXIvMHsLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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