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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3743ca31f09124fea13447262edac5e2935de02c2128aac14105168bf7eb9fd6' 
  AND token = '8EPY+gwkBTurBB+Rr+xA8514fNCu8wUb9OQ/R+RgA10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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