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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597e07ee62224f0c6bf368fd9f860a30463032fcf06cef5909329623a3dd337b' 
  AND token = 'UkiRvXSM3+J/i6yVrCGNsgvSo/ERHvbcDIP8oTOziic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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