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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4be7ac2dfd44e1d3cb28f9b7e311ec4d2f241f1549e9847a8dcee3209efeaaa' 
  AND token = 'v1hrC9l9i/IZf3B33P7DJ8Xse+IrKHxjqR4kW6lFLcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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