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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a723b199b248891a8291c194c0efced5be613fb60d84c8efde61fa136e71f127' 
  AND token = 'KXPrKd1lWOcFSDS+08g1nt4EV6cQASq4Ht/cXYm2nck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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