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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6efd47c0384e85254d9588b1b49ca0731c3ea2336a777ec5100708776b6ac6' 
  AND token = '2nTCafP0l2ZDaEAcdgqL8J+DE/E326Ormeq8BtbymFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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