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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc4e49928aa0e9830bcf1e9d5235ad8b8e5c1fa83b54dd5d9f49927e10bf3ba' 
  AND token = 'gFkpz4Q4t235lO17bT42fdJCA1tIDmRM++tqKr4dyIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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