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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa27959919bb5f882aa992f891b4a24b0094301e8ae15d8f36bf8e18a9fb8e7f' 
  AND token = '2xU4YHEYGe+gciSWqK8y+TXUw7tta7+irTa8Hy/HB8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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