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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d16ffe94be65e39355aa94e476b1cfb9470ad8e4d599907cb080e7698b40fa6' 
  AND token = '9d2aPNW2m6skJuyuDnxIP5ruJUvaVg+3ryvdM1o0ifw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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