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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087fb80c5ab92678f396788b358bdf576fbdfaabaaa793c1ed74954bc1804cc7' 
  AND token = '8fsu6+QhhbCKWXoET1OgF3fCIopolpij0RSkrQO46Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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