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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdd67fa84c119472a469a434c49ee6abe3180fa092753f08b77bc6863162fb2' 
  AND token = '14AMMwFaWX9FObq0JhsddP/KsdbFf8bjSy+sDzqy0kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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