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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4eec095bae691804b04ca495ca604bf8a20233744928eeebd4d4f3f14895a29' 
  AND token = 'UMaFTBH7QpKAc9J0mlmKaV1XdNik9MjfThIL0cMwBJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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