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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab6267a539f66084c2a8b000bfb545d59be636fdadc47ed85bbf8be81f1f2b3' 
  AND token = 'Bsu31UFANC63Y9xakcnl6wtPmbLO0B9k1yFW6tYXH08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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