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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8201f6155ccacf1dfd2c68671b480c4e608554e145a5906007096d5a7cfff8' 
  AND token = 'a4rMPiRyd3GzE+ebA8jSZ2VLeQHOZBSd6Su9Q+fI04Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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