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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47fc64ecbd6c7df25f45e7feb156ff3d3a8ab84fd5b1ec37e57953c9b42dea63' 
  AND token = '24gzyM2O0UU4z38u9CXFTPZIxE4Y2OxXIE9QEIJ40z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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