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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61ad46d5a7047947fa4dc7b52cbe43f3e2cb56044192901e4473bced8f8b167' 
  AND token = 'Fw3lKuxjiVyaKOUfSK4zu89GweGJ1l1bZkVNmhh3SaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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