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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb05e5ca8afde3baa1cb1720eac7f4dbcf7aa22188f36fee7038f82a336975fe' 
  AND token = '7jj5wM4MsAEtW7xzHRhk6FPclan42vRPDlFDiI4Ca+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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