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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2755fff0b0eac6f4cf32449db15724a975f4cf0d4198efce3003a562e706a3' 
  AND token = '7qPeRHhAMYCbeeVFqPBS9nwvNp3mwj5Db5j+rdWdyPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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