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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118913f309f2c085c87824c0abfddf82994169866ca921cc606d040072311de8' 
  AND token = 'IC8FOmwz9yOYsbS/E5qO9hEufKWN/bFE+rxxig4fpd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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