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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9800aaa656d44efdf8b69042e8ea5a99643a492c0ab97f46cf2348bd72b829' 
  AND token = 'zG8UeCr6870yJOwxS1YQ3iAtBHzm/zPYEMenkfDiIL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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