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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02926e7bfc97092c4c9459353b7e26b4c3ca463f8f08903f8ff22fd181835b6d' 
  AND token = 'niZ3IXN05d6d9Xs/LQepHz5BtHSDaiw5B84Bwc2pw+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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