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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0033731fb28ca0a0afc794d9329d23eef97c7f5cc5cb755ad6754d4434616c71' 
  AND token = 'G97wqQIbfrao86Q/SxpmiT8eeXG2ghIL2kvyLV/cBP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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