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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c9e59343b6d7295a64d5b8b5a2e33cf84b4f8c5c799a2576558ac3c8f16fec' 
  AND token = 'nqe7ScUcfFvB6jS9ciZTRZmlfnHibH6za5eM85dIa8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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