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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f50ac8e807c7aca293d338f238194b2699f6cc2d0a28243caed5d31a99bc6e' 
  AND token = 'U33b+nh5IcOx0AfcqK4dUSsO6xFXrHWgoRL49w9Snc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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