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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e56b2b15c3b5de6becb55549c283cb4c5ece18d0d729267ef7d0d83d4ccbe34' 
  AND token = '8fI8DWwou81tExWTeyfWdsB+xw7UfaccSNRd0j1mHIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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