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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459507eefae8edfb98de36cde6614947698407ab1af33b18020fcf62d22ae771' 
  AND token = 'wON+jmQloe9iOAdpxbG/51hLPjB9SYAkMsUcfhDSsiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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