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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d73371b6fb09ca0e47fbde9101b44f04c86862895ff96c5aa53e847d717995' 
  AND token = 'xU9B4Q9rthbp88DUrV0n/kDz2SyJL03DqHw7yj2c50I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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