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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c112a8c4f27fe02591ad361f125895f1964819dcd938198eb69d8c4245a9c9a' 
  AND token = 'GQ0eHXKRsVZaM3Q1gbULoeIGV8ZBZ4FvJbkqeIhlaBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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