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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7afed5148641f641c6ba45f77e8ff0e037876e1e864d3336157a0d03103c3d0' 
  AND token = 'fjEycp6IiJlJF8ZWI+FsyT9u8rREeJSYE8uY2jr9GYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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