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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f83f09b2d7dd67439c31cf55869244307c52726b578d4f99c451a152c29b596' 
  AND token = 'J6lnC0fy7bDzIopHCCwMD5gi/XAvSpFuD7sn6oOjsIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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