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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7686d6e09606f0bac32bb6f99f922ce4de74b8bebf08d6b4fdc416ed9904be' 
  AND token = '1iuOsaSb4xT/pCoA3KDs0waYPDH/yTIUaKwUAODmcBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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