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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083dc2b9fce250d9b4ef68fc4f3b1d8dfda1317a7a8ac5bcb20386d1009735ef' 
  AND token = 'y7ZMCM1eoTb5zfDQ6vCQxP+8mNbVc58UyqsdVRkTuLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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