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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a0c4b1d623a572158f3ba07d74044130c75fb88d063c7176a48f9eb5a669b7' 
  AND token = 't2urvau/sSITeI5ZZkIeu6DPps2ZR4MOCm6ZAjW1vZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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