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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa293e21c71aa23243a5c6dac84a6270dea15042ed266e6aa112cfc9f86380fd' 
  AND token = 'UfOjB5vJCevJbfClx2GRAFA3RoXW0U1B9s40sItn/Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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