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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d598a0deaf25fa7f8fd64fd7ec6d85fe484fefafd564af2b2bd2dcc402415e2' 
  AND token = 'pQh6HH5aZZoQOluzDRr2ZotsolM2HHjESxjAUOZ3j4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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