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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe388b9e8628feb608c32233cc6bd0c31ac2f28e56581d1d769b6ba04352a9f' 
  AND token = 'd0nOwN4ZYjHuGCnl0ATmp18nlNCdWlqaCyBgRQzwPr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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