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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58fb4408e98837170bdfd84bbbffeb2cec27ec9fb3d30465f4c2d5a6ba10197' 
  AND token = 'na7KNTM49glK5HwkhV0LlaQTMP4YBOQiDJjswbe745k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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