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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce62256ae286593c530071b26d57873a47f3ac7f6eddc2e52bb0288fb980aa2' 
  AND token = '3jc6VNrIUdo+W5PkXMUg6ytBN9cUFYTm5u4CIyTUZQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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