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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268c5375999a14c14c36ea0c5c3571e46787ab3d4b2ea1ebadbdb42ce334a3b7' 
  AND token = 'sU3Ni2ErL0og4uFsY04JxcEQQd2ctbYQDGpkh7xzQ2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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