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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa42fb09d9705e94dc4efbe731e74ea427720b6ab4096623ba3694ba77b71df' 
  AND token = 'VXaBXaLsjabRZQpAUK8CPUCwlMVOEPzVN/pzs+alvcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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