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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6d30861acf9486d50d9142c337e276b47a167e4d3ef95b5a72ee226cdff9af' 
  AND token = 'hMi2KRq9FLX+15rFhteoSB0MERLDs6XWn+BJG2c2NW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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