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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fb2c8332bd97d7a49fcb87dc985aa2cf9f6825128c0dbd473043d2aa31c492' 
  AND token = 'p9nOSBif32Sie8J/WDAIGvSgCl6Fa1xVBh30iQgMY18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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