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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7db12dcbb65bcb38fa4d4a4ccb3be9c7c84c3dd45c595a0f140c17ef444072' 
  AND token = 'jJ1Mfdye9oAWf32+Jc91xgirliCA0GaDX844OlKvuvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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